What is the angle of incidence? angle of reflection?

The angle of incidence is the angle between the incident beam and the perpendicular to the surface.
Reflection angle – the angle between the reflected beam and the perpendicular to the surface.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.